What? Why that? Are you planning to do the same? What's your father's reaction to that and knowing that they are probably legitimate as you told? Well, Iranians as any other people are free to do what they want and have the views they want to in my opinion. If they don't like their Arab heritage or the Arab names they were given by their parents.
I don't know about you but reading about Iranian Arabs they seem as a quite well integrated minority, albeit not very big (2% of Iran's population) who have contributed A LOT to Iran given their small size. From way back. Even the same Iranian Arabs were the first line of defense against Saddam's Iraq. So they have shown their loyalty. That many probably want more rights and some even a bigger say in the regions were Arabs are the majority or a big minority is something differently.
I do believe that most Arabs and Iranians can live and function without any problems. Or other Semitic people (Jews). History shows this in abundance. Even way before Islam came. We have Pakistani users in the US telling about how American Arabs and Iranian Americans cooperates, we see it in Europe and we see it in the GCC and in Iran.
The thing is though that many atheist Iranians and nationalists, due to the recent events (Iranian revolution in 1979, Iraq-Iran war) and the current sectarian conflicts are anti-Arab and vice versa.